Jim wrote:
Well, thanks for the replies so far. Obviously I won't be able to
hear NSA or AF1 etc even though they use the same frequency spectrum
for communication. Most likely they'd use spread spectrum and/or some
other kind of encryption. Theoretically any type of signal that can
be encoded can be decoded. So, am I correct that scanners can't
receive and decode ALL signals even if they are in standard AM, FM,
SSB modes?

I'd be dumbfounded if AF1 broadcasts in standard AM mode on 126.5 MHz
for instance. Thus, having a scanner that covers airband wouldn't be
able to receive AF1 communication.

You WILL, repeat WILL hear AF1 broadasts in the clear in standard AM on
the VHF and UHF aviation bands. You will NEVER hear AF1 calling ATC
(Air Traffic Control) in anything but standard AM modes on VHF, if they
did ATC would never hear them as ATC has no form of "kaptain krunch
encoding/decoding rings" in their facility.

Listen to this: http://www.milaircomms.com/audio/032603airforceone.mp3
This is AF1 in "standard" AM in Florida on March 26, 2003 I caught these
comms between Airforce One and Jacksonville Center (ATC). You'll hear
AF1 contacting several different sectors in the JAX Center area.
Frequencies this was recorded are 126.3500, 134.0000, 133.3250 MHz.

I guess your "dumbfounded" now....just kidding

George
http://www.MilAirComms.com

And you'll wont see "spread spectrum" ever being used in the VHF air
bands....at least not in our life time or that of our
children....remember they're still using AM and that won't change for at
least 50 more years......

George
http://www.MilAirComms.com


Eddie Haskel wrote:
They won't hear "Spread Spectrum" at all.....Eddie

"Jim" wrote in message
om...

My guess would be all non-voice mode communications taking place in
the frequency coverage. I guess my main concern is what if I can't
receive even the voice communication unless it is FM or AM. For
instance, to hear trunk services, one needs expensive scanner (eg.
Radio Shack Pro-96). Any comments?

I heard Air Force One one evening when Clinton was leaving my county's
airport after some stops in south NJ. Some local hams were announcing the
frequencies to monitor as it left the Trenton area and went into
Philadelphia ATC space, and I just happened to be monitoring the local
repeaters that evening. As I recall, it was all on the standard
Approach/Departure channels for these airports.

- Doug

"Jim" wrote in message
om...
I'd be dumbfounded if AF1 broadcasts in standard AM mode on 126.5 MHz
for instance. Thus, having a scanner that covers airband wouldn't be
able to receive AF1 communication.

(Vic Martinez) wrote in message
...
You won't recieve Air Force One(oops! 'Echelon' just picked up that one)
The NSA,(they're on their their way to my house) and the FBI.(excuse me,
the 'men in black' are at my door. Boy! those guys are fast!)

Can't hear a tree fall in the forrest

I thought 'Forest' had one 'r'.

Truck tracking is a different story. You can still listen to

isn't truck tracking what you do while listening to CB frequencies instead of
scanner frequencies.

thought 'Forest' had one 'r'.


unless it's Forrest Gump.

Or that guy who hosted the latest tv version of The Twilight Zone, "Forrest
Whittaker"..

Stacy Keach is hosting the current episodes of "The Twilight Zone", only on
radio.